Can I short the main differences between the GS230 and GS330 say?
There were some rumors about a visibly worse Picture in GS230 (sharpness problems va). Panasonic On-Lens (vs. Leica in the GS330) is not because the GS180 (also "only" Pana Lens) these problems are definitely not.
The other differences you find in the comparison lists, or they already know.
Regards,
Markus